[245] Add test for negative prefix in relative-json-pointer

Affects drafts 2019-09 and 07.

Author: ssilverman

tests/draft2019-09/optional/format/relative-json-pointer.json

@@ -9,7 +9,7 @@
                 "valid": true
             },
             {
-                "description": "a valid downwards RJP",  
+                "description": "a valid downwards RJP",
                 "data": "0/foo/bar",
                 "valid": true
             },
@@ -27,6 +27,11 @@
                 "description": "an invalid RJP that is a valid JSON Pointer",
                 "data": "/foo/bar",
                 "valid": false
+            },
+            {
+                "description": "negative prefix",
+                "data": "-1/foo/bar",
+                "valid": false
             }
         ]
     }

tests/draft7/optional/format/relative-json-pointer.json

@@ -9,7 +9,7 @@
                 "valid": true
             },
             {
-                "description": "a valid downwards RJP",  
+                "description": "a valid downwards RJP",
                 "data": "0/foo/bar",
                 "valid": true
             },
@@ -27,6 +27,11 @@
                 "description": "an invalid RJP that is a valid JSON Pointer",
                 "data": "/foo/bar",
                 "valid": false
+            },
+            {
+                "description": "negative prefix",
+                "data": "-1/foo/bar",
+                "valid": false
             }
         ]
     }